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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a79ab12bd9668a357074ecb462d4bf3313250d92bd3beb98c6e93c54687676' 
  AND token = '6vlOVCHWUsyW6yUXpiJTob6f9GfgprVGMVvwgBH3Mgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}